EP1384806A1 - Method and sewing machine for drawing the free end of a needle thread from the upper surface of a piece of fabric to its lower surface - Google Patents

Method and sewing machine for drawing the free end of a needle thread from the upper surface of a piece of fabric to its lower surface Download PDF

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Publication number
EP1384806A1
EP1384806A1 EP03015351A EP03015351A EP1384806A1 EP 1384806 A1 EP1384806 A1 EP 1384806A1 EP 03015351 A EP03015351 A EP 03015351A EP 03015351 A EP03015351 A EP 03015351A EP 1384806 A1 EP1384806 A1 EP 1384806A1
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EP
European Patent Office
Prior art keywords
thread
needle
presser
fabric
needle thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03015351A
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German (de)
French (fr)
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EP1384806B1 (en
Inventor
Johann Enns
Sevki Dr.-Ing. Hosagasi
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Duerkopp Adler AG
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Duerkopp Adler AG
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Publication date
Application filed by Duerkopp Adler AG filed Critical Duerkopp Adler AG
Priority to SI200330796T priority Critical patent/SI1384806T1/en
Publication of EP1384806A1 publication Critical patent/EP1384806A1/en
Application granted granted Critical
Publication of EP1384806B1 publication Critical patent/EP1384806B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D05B47/04—Automatically-controlled tensioning devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/02—Presser-control devices

Definitions

  • the invention relates to a method for pulling the free end of the thread a needle thread from the top of at least one Nähgutmaschines on the bottom of the first stitch of a seam to be sewn according to the The preamble of claim 1 and a sewing machine for implementation the method according to the preamble of claim 3.
  • a method and a sewing machine of the generic type is known from DE 36 04 299 C2 (according to US-PS 4, 658, 752) known.
  • the pressing force of the fabric presser drive is adjustable. This should be possible, even very thin, light use tearing threads or extra thick threads.
  • the Thread clamp adjustable in its acting on the needle thread friction force is adjustable.
  • the invention is based on the object, a method of the generic Kind and a sewing machine for performing the method so to design that adaptation to different sewing conditions, in particular different thicknesses of the at least one workpiece part is reached.
  • the object continues according to the invention in a sewing machine the preamble of claim 3 by the features in the characterizing part solved.
  • the invention is particularly advantageous Can be used on a sewing machine with alternating fabric pressers and needle transport.
  • the sewing machine shown in the drawing has an upper arm. 1 and a lower box-like base plate 2, which by a stand. 3 are connected together to form a C-shaped housing.
  • an arm shaft 4 mounted by means of a belt drive 5 of a Motor 6 is driven.
  • a control box 7 Connected to the motor 6 is a control box 7, in which a microprocessor controller 8 is housed.
  • a needle bar 10 up and down driven, at the lower end of a needle 11 is attached.
  • a gripper 12 is arranged, in the usual manner derived from the arm shaft 4 is rotatably driven about its axis.
  • In arm 1 is also a lifting gear 14 for adjusting the lifting height a arranged by still to be described Stoffd Wegern to which a control shaft 15 heard.
  • This actuating shaft 15 has a guide groove 16 in which a Slider 17 is arranged longitudinally displaceable.
  • On the sliding block 17 is a lever 18 pivotally mounted with one end, the other end with a first arm 19 of an angle lever 20 is pivotally connected.
  • the angle lever 20 is at the intersection of its first arm 19 and his second arm 21 pivotally supported in a machine-fixed bearing 22.
  • the lever 18 engages approximately centrally a pull rod 23, which is connected to a Excenter 24 attacks, which in turn is coupled to the arm shaft 4.
  • a fabric presser 25 is further arranged, the one in a Sliding bearing 26 vertically displaceably mounted presser rod 27th and has a pusher foot 28 attached to the lower end thereof.
  • the fabric presser 25 is also a function of a fabric presser performing pulp conveyor 29 arranged, the one in a Sliding bearing 30 slidably arranged feed dog rod 31, at the lower end of a transport foot 32 is attached.
  • the Sliding bearing 30 and thus the mass transferor 29 is in a swing frame 33 attached, in which also the needle bar 10 in another Sliding bearing 34 is slidably mounted, wherein the feed dog rod 31 and the needle bar 10 are arranged parallel to each other.
  • Oscillating frame 33 is pivotally mounted in a bearing 35 in the arm 1 and is by means of a thruster, not shown on a Pulling rod 36 driven, via a bearing 37 with the swing frame 33 is pivotally connected.
  • a thrust gear is, for example from DE 34 23 843 C2 (corresponding to US 4,616,586) known.
  • the drive of the fabric presser 25 and the material conveyor 29 is carried out by the angle lever 20, the second arm 21 with a triangular trained drive lever 38 is pivotally connected, wherein the second Arm 21 via a pull rod 21 a with a tip of the drive lever 38th connected is. At the other two tips are transmission lever 39, 40 articulated with the upper ends of the fabric pusher rod 27 and the feed dog rod 31 are hinged.
  • the drive lever 38 in turn, is pivotally supported by a link 41 in a bearing 42, which is arranged in the arm 1.
  • the handlebar 41 is biased by a Screw compression spring 43 loaded, so that the handlebar 41 and so that the presser foot 25 and the fabric conveyor 29 down be pressed.
  • the stop 45th has, which is associated with the handlebar 41 below the compression spring 43.
  • On stop lever 44 engages a pneumatically acted on piston-cylinder drive trained stop adjustment drive 46, wherein whose piston rod 47 is articulated on the stop lever 44, while its cylinder 48 is hinged in the stator 3.
  • the drive 46 is designed as unilaterally acted piston-cylinder drive, i. at the piston rod 47, a piston 49 is mounted, of which the piston rod 47 opposite side via a compressed air line 50 by means of compressed air can be acted upon, so that when compressed air is applied to the piston rod 47 is pushed out of the cylinder 48, whereby the stopper 45 for Stop lever 44 is adjusted towards.
  • the control shaft 15 for the presser foot 25 is provided with a control lever 55, by means of which the actuating shaft 15 are pivoted about its axis can, which in turn the location of the guide groove 16 for the sliding block 17 is changed.
  • the lever 55 With the lever 55 so the lifting height is the a Presser 25 and the fabric conveyor 29 set.
  • the smallest and the largest value of the adjustable lifting height a is indicated by two on the arm 1 attached adjustable limit stops 56, 57 set between which engages a mounted on the control shaft 15 lever 58. It For example, 2.0 mm ⁇ a ⁇ 8.0 mm.
  • a rotary potentiometer 59 is coupled, via a signal line 60, the rotational angular position of the control shaft 15 as a measured variable to the controller 8 reports.
  • the needle thread 62 is from this stock 61 in the usual way via a thread tensioning device 63, a thread lever 64 and a thread clamp 65 led to the needle 11.
  • the thread tensioning device 63 is from DE 28 09 848 C2 (corresponding to US 4,289,087). She points two the needle thread 62 between them thread tension discs 68th and an electromagnet 67. According to the electromagnet 67 applied voltage is between the clamping washers 66 thus an adjustable friction force on the needle thread 62nd exerted, whereby this receives a corresponding thread tension.
  • the thread clamp 65 which is immediately upstream of the needle 11, points a clamping washer 68 which is fixed to a guide rod 69, the is again loaded by a compression spring 70, whereby the clamping disc 68 is pulled against an abutment 71 which is attached to the arm 1 is.
  • abutment 71 is further formed by a wire winding 72
  • Electromagnet 72 mounted by means of a drive line 73 can be controlled by the controller 8 forth.
  • the throat plate 76 is with provided a cut through which a lower feed dog 77 through protrudes, which has a tap hole 77a for the passage of the needle 11.
  • the lower feed dog 77 is kinematically with the mentioned thrust gear connected such that the stitch hole 77 a in synchronism with during the stitch formation in the Nähgutmaschine 74, 75 piercing and the transport movement also executing needle 11 is moved.
  • the described Construction and operation are in sewing machines with so-called Needle transport common and well known.
  • the two workpieces 74, 75 have a total thickness s.
  • the lifting height a the feet 28, 32 on the workpieces 74, 75 represents the operator by means of the control lever 55 a. It is assumed that the Operator with increasing thickness s of the workpiece parts 74, 75 the Lifting height a increases, because with increasing thickness s the compressibility the two workpieces 74, 75 increases.
  • the needle 11 dives with the needle thread 62 through the Nähgutmaschine 74, 75 in the needle hole 77 a.
  • the transport foot 32 in the lowered position and the feed dog 77th in a raised position, so that the Nähgutmaschine 74, 75 between the feed dog 77 and the transport foot 32 are clamped.
  • the pusher foot 28 according to the lifting height a above the fabric part 74, so that unimpeded advancing the from the needle 11 interspersed Nähgutmaschine 74, 75 in a feed direction 82 takes place.
  • the thread clamp 65 is opened, so that the needle thread 62 unimpeded as a result of the downward movement of the needle 11 can be.
  • the gripper tip 79 of the detected rotating gripper 12 during the upward movement of the needle eleventh formed needle-thread loop 78. With progressive upward movement the needle 11 finally exits them from the fabric parts 74, 75. Meanwhile, the gripper 12 has a complete looping of the needle-thread loop 78 causes the looper thread supply 13. Subsequently, the Excess needle thread 62 through the thread lever 64 to form a Lockstitch seam 81 withdrawn. After that, the pusher foot 28 and the transport foot 32 implemented, so that the pusher foot 28th on the workpieces 74, 75 touches and the transport foot 32 to the Lifting height a lifts from the same. During normal sewing the thread clamp 65 serves only as a guide of the needle thread 62; she so do not slow him down. The described stitch formation and the way of working the alternating-acting pusher feet 28, 32 are with needle transport common and known.
  • the first seam to be sewn seam 81 is the free end 83 of the needle thread 62, so the needle thread beginning, above the workpieces 74, 75 and is between the upper fabric part 75 and the pusher foot 28 clamped with one of the bias of the Compression spring 43 dependent force.
  • the distance b of the stopper 45 from the handlebar 41 increases with increasing Thickness s of the fabric pieces 74, 75 too, i. the idle stroke from the beginning of the extension the piston rod 47 to the abutment of the stop 45 on the handlebars 41 increases with increasing material thickness s.
  • the duration of the activation of the stop adjustment drive 46 enlarged and that according to an empirical determined, in Fig. 7 indicated function, where the loading time t is shown above the lifting height a. This feature is in one ROM 84 of the controller 8 down.
  • the larger the fabric thickness s is, the larger - as indicated above - the lifting height a.
  • the driving time of the Stop adjustment drive 46 increases, whereby the loss of time during the idle stroke is compensated over the distance b.
  • the with increasing Thickness s of the fabric parts 74, 75 increasing compressibility of the Workpiece parts 74, 75 balanced.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

A sewing machine mechanism to draw the free end (83) of the upper thread (62) through the upper surface of the fabric workpiece (74,75) to the under surface on the first stitch of a stitched seam, has a needle (11) to carry the thread from its bobbin. The looper (12) forms the upper thread loop under the fabric, while the upper thread is clamped between the needle and the upper thread lever (64). At a sewing machine, the mechanism to draw the free end (83) of the upper thread (62) through the upper surface of the fabric workpiece (74,75) to the under surface on the first stitch of a stitched seam, has a needle (11) to carry the thread from its bobbin. The looper (12) forms the upper thread loop under the fabric, while the upper thread is clamped between the needle and the upper thread lever (64). While the upper thread is clamped, the presser foot (25) is at least partially relaxed for a duration which is extended on an increasing fabric thickness (s).

Description

Die Erfindung betrifft ein Verfahren zum Ziehen des freien Fadenendes eines Nadelfadens von der Oberseite mindestens eines Nähgutteiles auf dessen Unterseite beim ersten Stich einer zu nähenden Naht gemäß dem Oberbegriff des Anspruches 1 und eine Nähmaschine zur Durchführung des Verfahrens gemäß dem Oberbegriff des Anspruches 3.The invention relates to a method for pulling the free end of the thread a needle thread from the top of at least one Nähgutteiles on the bottom of the first stitch of a seam to be sewn according to the The preamble of claim 1 and a sewing machine for implementation the method according to the preamble of claim 3.

Ein Verfahren und eine Nähmaschine der gattungsgemäßen Art ist aus der DE 36 04 299 C2 (entsprechend US-PS 4, 658, 752) bekannt. Bei der bekannten Nähmaschine ist die Andrückkraft des Stoffdrücker-Antriebs einstellbar. Hierdurch soll ermöglicht werden, auch besonders dünne, leicht reißende Fäden oder besonders dicke Fäden einzusetzen. Weiterhin ist die Faden-Klemme in ihrer auf den Nadelfaden wirkenden Reibkraft einstellbar.A method and a sewing machine of the generic type is known from DE 36 04 299 C2 (according to US-PS 4, 658, 752) known. In the known Sewing machine, the pressing force of the fabric presser drive is adjustable. This should be possible, even very thin, light use tearing threads or extra thick threads. Furthermore, the Thread clamp adjustable in its acting on the needle thread friction force.

Es hat sich gezeigt, dass mit zunehmender Nähgutdicke die Druckentlastung des Stoffdrückers abnimmt, d.h. mit zunehmender Dicke des mindestens einen Nähgutteils nimmt die Zuverlässigkeit ab, mit der das freie Fadenende, also der Nadelfaden-Anfang, beim ersten Stich von der Oberseite des Nähgutteils auf dessen Unterseite durchgezogen wird.It has been shown that with increasing material thickness, the pressure relief of the fabric presser decreases, i. with increasing thickness of at least a piece of fabric decreases the reliability with which the free end of the thread, so the needle thread beginning, the first stitch from the top of the fabric part is pulled through on the underside.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der gattungsgemäßen Art und eine Nähmaschine zur Durchführung des Verfahrens so auszugestalten, dass eine Anpassung an unterschiedliche Nähbedingungen, und zwar insbesondere unterschiedliche Dicken des mindestens einen Nähgutteils erreicht wird. The invention is based on the object, a method of the generic Kind and a sewing machine for performing the method so to design that adaptation to different sewing conditions, in particular different thicknesses of the at least one workpiece part is reached.

Diese Aufgabe wird bei einem Verfahren der gattungsgemäßen Art durch die Merkmale im Kennzeichnungsteil des Anspruches 1 gelöst. Durch die erfindungsgemäßen Maßnahmen wird erreicht, dass mit zunehmender Dicke des Nähgutteils die Dauer der Entlastung erhöht wird. Bevorzugt geschieht dies indirekt, indem nach Anspruch 2 die Dauer der Entlastung in Abhängigkeit von der Hubhöhe des mindestens einen Stoffdrückers erfolgt, die wiederum in Anpassung an die Nähaufgabe maschinenseitig eingebbar sein kann (vgl. Anspruch 5).This object is achieved by a method of the generic type the features in the characterizing part of claim 1 solved. By the inventive measures is achieved that with increasing thickness of the workpiece the duration of the discharge is increased. Preferably happens this indirectly, by according to claim 2, the duration of the discharge in Depending on the lifting height of the at least one presser foot, which in turn can be entered on the machine side in adaptation to the sewing task can be (see claim 5).

Die Aufgabe wird weiterhin erfindungsgemäß bei einer Nähmaschine nach dem Oberbegriff des Anspruches 3 durch die Merkmale in dessen Kennzeichnungsteil gelöst. Nach Anspruch 4 ist die Erfindung besonders vorteilhaft einsetzbar bei einer Nähmaschine mit alternierenden Stoffdrückern und Nadeltransport.The object continues according to the invention in a sewing machine the preamble of claim 3 by the features in the characterizing part solved. According to claim 4, the invention is particularly advantageous Can be used on a sewing machine with alternating fabric pressers and needle transport.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. Es zeigt

Fig. 1
eine Vorderansicht einer Nähmaschine,
Fig. 2
die Faden-Klemme der Nähmaschine in vergrößerter Darstellung,
Fig. 3
eine Seitenansicht der Nähmaschine in schematisierter, vergrößerter Darstellung entsprechend dem Sichtpfeil III in Fig. 1,
Fig. 4
eine perspektivische schematische Darstellung des Stichbildebereichs der Nähmaschine,
Fig. 5
die Nadel der Nähmaschine bei der Abwärtsbewegung während der Erzeugung des ersten Stiches in den Nähgutteilen,
Fig. 6
zwei mittels einer Naht verbundene Nähgutteile, bei denen die Fadenenden von Nadel- und Greiferfaden sich an der Unterseite der Nähgutteile befinden und
Fig. 7
ein Weg-Zeit-Diagramm, in dem die Betätigungs-Dauer eines Stoffdrücker-Entlastungs-Antriebs über der Hubhöhe des Stoffdrückers dargestellt ist.
An embodiment of the invention will be explained in more detail with reference to the drawing. It shows
Fig. 1
a front view of a sewing machine,
Fig. 2
the thread clamp of the sewing machine in an enlarged view,
Fig. 3
1 is a side view of the sewing machine in a schematic, enlarged view corresponding to the viewing arrow III in Fig. 1,
Fig. 4
a perspective schematic representation of the stitch forming area of the sewing machine,
Fig. 5
the needle of the sewing machine during the downward movement during the production of the first stitch in the workpieces,
Fig. 6
two connected by a seam workpieces in which the yarn ends of needle and looper thread are located on the underside of the workpieces and
Fig. 7
a path-time diagram in which the actuation duration of a presser-unloading drive over the lifting height of the fabric presser is shown.

Die in der Zeichnung dargestellte Nähmaschine weist einen oberen Arm 1 und eine untere gehäuseartige Grundplatte 2 auf, die durch einen Ständer 3 zu einem C-förmigen Gehäuse miteinander verbunden sind. Im Arm 1 ist eine Armwelle 4 gelagert, die mittels eines Riementriebes 5 von einem Motor 6 antreibbar ist. Mit dem Motor 6 verbunden ist ein Steuerkasten 7, in dem eine Mikroprozessor-Steuerung 8 untergebracht ist. Von der Armwelle 4 wird mittels einer Kurbel 9 eine Nadelstange 10 auf- und abgehend angetrieben, an deren unterem Ende eine Nadel 11 angebracht ist.The sewing machine shown in the drawing has an upper arm. 1 and a lower box-like base plate 2, which by a stand. 3 are connected together to form a C-shaped housing. In the arm 1 is an arm shaft 4 mounted by means of a belt drive 5 of a Motor 6 is driven. Connected to the motor 6 is a control box 7, in which a microprocessor controller 8 is housed. From the arm shaft 4 is by means of a crank 9 a needle bar 10 up and down driven, at the lower end of a needle 11 is attached.

In der Grundplatte 2 ist ein Greifer 12 angeordnet, der in üblicher Weise abgeleitet von der Armwelle 4 um seine Achse drehantreibbar ist. Auf dem Greifer 12 befindet sich ein Greiferfaden-Vorrat 13.In the base plate 2, a gripper 12 is arranged, in the usual manner derived from the arm shaft 4 is rotatably driven about its axis. On the Gripper 12 is a looper thread supply 13th

Im Arm 1 ist außerdem ein Hubgetriebe 14 zur Einstellung der Hubhöhe a von noch zu schildernden Stoffdrückern angeordnet, zu dem eine Stellwelle 15 gehört. Diese Stellwelle 15 weist eine Führungsnut 16 auf, in der ein Gleitstein 17 längs verschiebbar angeordnet ist. An dem Gleitstein 17 ist ein Hebel 18 mit einem Ende schwenkbar gelagert, dessen anderes Ende mit einem ersten Arm 19 eines Winkelhebels 20 gelenkig verbunden ist. Der Winkelhebel 20 ist am Schnittpunkt seines ersten Arms 19 und seines zweiten Arms 21 in einem maschinenfesten Lager 22 schwenkbar abgestützt. Am Hebel 18 greift etwa mittig eine Zugstange 23 an, die an einem Excenter 24 angreift, der wiederum mit der Armwelle 4 gekoppelt ist.In arm 1 is also a lifting gear 14 for adjusting the lifting height a arranged by still to be described Stoffdrückern to which a control shaft 15 heard. This actuating shaft 15 has a guide groove 16 in which a Slider 17 is arranged longitudinally displaceable. On the sliding block 17 is a lever 18 pivotally mounted with one end, the other end with a first arm 19 of an angle lever 20 is pivotally connected. The angle lever 20 is at the intersection of its first arm 19 and his second arm 21 pivotally supported in a machine-fixed bearing 22. The lever 18 engages approximately centrally a pull rod 23, which is connected to a Excenter 24 attacks, which in turn is coupled to the arm shaft 4.

Im Arm 1 ist weiterhin ein Stoffdrücker 25 angeordnet, der eine in einem Schiebelager 26 vertikal verschiebbar gelagerte Stoffdrücker-Stange 27 und einen an deren unterem Ende angebrachten Drücker-Fuß 28 aufweist. Neben dem Stoffdrücker 25 ist ein ebenfalls die Funktion eines Stoffdrückers ausübender Stofftransporteur 29 angeordnet, der eine in einem Schiebelager 30 verschiebbar angeordnete Transporteur-Stange 31 aufweist, an deren unterem Ende ein Transport-Fuß 32 angebracht ist. Das Schiebelager 30 und damit der Stofftransporteur 29 ist in einem Schwingrahmen 33 angebracht, in dem auch die Nadelstange 10 in einem weiteren Schiebelager 34 verschiebbar gelagert ist, wobei die Transporteur-Stange 31 und die Nadelstange 10 parallel zueinander angeordnet sind. Der Schwingrahmen 33 ist in einem Lager 35 im Arm 1 schwenkbar gelagert und wird mittels eines nicht dargestellten Schubgetriebes über eine Zugstange 36 angetrieben, die über ein Lager 37 mit dem Schwingrahmen 33 schwenkbar verbunden ist. Ein solches Schubgetriebe ist beispielsweise aus der DE 34 23 843 C2 (entsprechend US 4,616,586) bekannt.In arm 1, a fabric presser 25 is further arranged, the one in a Sliding bearing 26 vertically displaceably mounted presser rod 27th and has a pusher foot 28 attached to the lower end thereof. In addition to the fabric presser 25 is also a function of a fabric presser performing pulp conveyor 29 arranged, the one in a Sliding bearing 30 slidably arranged feed dog rod 31, at the lower end of a transport foot 32 is attached. The Sliding bearing 30 and thus the mass transferor 29 is in a swing frame 33 attached, in which also the needle bar 10 in another Sliding bearing 34 is slidably mounted, wherein the feed dog rod 31 and the needle bar 10 are arranged parallel to each other. Of the Oscillating frame 33 is pivotally mounted in a bearing 35 in the arm 1 and is by means of a thruster, not shown on a Pulling rod 36 driven, via a bearing 37 with the swing frame 33 is pivotally connected. Such a thrust gear is, for example from DE 34 23 843 C2 (corresponding to US 4,616,586) known.

Der Antrieb des Stoffdrückers 25 und des Stofftransporteurs 29 erfolgt von dem Winkelhebel 20 aus, dessen zweiter Arm 21 mit einem dreieckförmig ausgebildeten Antriebshebel 38 gelenkig verbunden ist, wobei der zweite Arm 21 über eine Zugstange 21 a mit einer Spitze des Antriebshebels 38 verbunden ist. An den beiden anderen Spitzen sind Übertragungshebel 39, 40 angelenkt, die mit den oberen Enden der Stoff-Drücker-Stange 27 bzw. der Transporteur-Stange 31 gelenkig verbunden sind. Der Antriebshebel 38 wiederum ist über einen Lenker 41 schwenkbar in einem Lager 42 abgestützt, das im Arm 1 angeordnet ist. Der Lenker 41 ist mittels einer vorgespannten Schrauben-Druckfeder 43 belastet, so dass der Lenker 41 und damit auch der Stoffdrücker 25 und der Stofftransporteur 29 nach unten gedrückt werden. Unterhalb des Lenkers 41 ist ein ebenfalls im Lager 42 schwenkbar gelagerter Anschlag-Hebel 44 gelagert, der einen Anschlag 45 aufweist, der dem Lenker 41 unterhalb der Druckfeder 43 zugeordnet ist. Am Anschlag-Hebel 44 greift ein als pneumatisch beaufschlagbarer Kolben-Zylinder-Antrieb ausgebildeter Anschlag-Verstell-Antrieb 46 an, wobei dessen Kolbenstange 47 am Anschlag-Hebel 44 angelenkt ist, während sein Zylinder 48 in dem Ständer 3 gelenkig befestigt ist. Der Antrieb 46 ist als einseitig beaufschlagbarer Kolben-Zylinder-Antrieb ausgebildet, d.h. an der Kolbenstange 47 ist ein Kolben 49 angebracht, dessen der Kolbenstange 47 abgewandte Seite über eine Druckluft-Leitung 50 mittels Druckluft beaufschlagbar ist, so dass bei Druckluft-Beaufschlagung die Kolbenstange 47 aus dem Zylinder 48 ausgeschoben wird, wodurch der Anschlag 45 zum Anschlag-Hebel 44 hin verstellt wird. Bei Druckentlastung erfolgt eine Rückstellung des Kolbens 49 und damit der Kolbenstange 47 mittels einer Rückstell-Feder 51. Die Druckluftbeaufschlagung wird über ein 3/2-Wege-Ventil 52 gesteuert, das einerseits von einer nicht dargestellten Druckluftquelle über eine Druckluft-Versorgungsleitung 53 mit Druckluft versorgt wird. Andererseits wird es elektromagnetisch betätigt, wozu es über eine elektrische Leitung 54 mit der Steuerung 8 verbunden ist.The drive of the fabric presser 25 and the material conveyor 29 is carried out by the angle lever 20, the second arm 21 with a triangular trained drive lever 38 is pivotally connected, wherein the second Arm 21 via a pull rod 21 a with a tip of the drive lever 38th connected is. At the other two tips are transmission lever 39, 40 articulated with the upper ends of the fabric pusher rod 27 and the feed dog rod 31 are hinged. The drive lever 38 in turn, is pivotally supported by a link 41 in a bearing 42, which is arranged in the arm 1. The handlebar 41 is biased by a Screw compression spring 43 loaded, so that the handlebar 41 and so that the presser foot 25 and the fabric conveyor 29 down be pressed. Below the handlebar 41 is also in the camp 42nd pivotally mounted stop lever 44 mounted, the stop 45th has, which is associated with the handlebar 41 below the compression spring 43. On stop lever 44 engages a pneumatically acted on piston-cylinder drive trained stop adjustment drive 46, wherein whose piston rod 47 is articulated on the stop lever 44, while its cylinder 48 is hinged in the stator 3. The drive 46 is designed as unilaterally acted piston-cylinder drive, i. at the piston rod 47, a piston 49 is mounted, of which the piston rod 47 opposite side via a compressed air line 50 by means of compressed air can be acted upon, so that when compressed air is applied to the piston rod 47 is pushed out of the cylinder 48, whereby the stopper 45 for Stop lever 44 is adjusted towards. When pressure is released a Return of the piston 49 and thus the piston rod 47 by means of a Return spring 51. The compressed air is supplied via a 3/2-way valve 52 controlled, on the one hand by a compressed air source, not shown supplied via a compressed air supply line 53 with compressed air becomes. On the other hand, it is electromagnetically operated, what it about a electrical line 54 is connected to the controller 8.

Die Stellwelle 15 für den Stoffdrücker 25 ist mit einem Stellhebel 55 versehen, mittels dessen die Stellwelle 15 um ihre Achse verschwenkt werden kann, wodurch wiederum die Lage der Führungsnut 16 für den Gleitstein 17 verändert wird. Mit dem Stellhebel 55 wird also die Hubhöhe a des Stoffdrückers 25 und des Stofftransporteurs 29 festgelegt. Der kleinste und der größte Wert der einstellbaren Hubhöhe a wird durch zwei auf dem Arm 1 angebrachte einstellbare Begrenzungsanschläge 56, 57 festgelegt, zwischen welche ein an der Stellwelle 15 angebrachter Hebel 58 eingreift. Es gilt beispielsweise 2,0 mm ≤ a ≤ 8,0 mm.The control shaft 15 for the presser foot 25 is provided with a control lever 55, by means of which the actuating shaft 15 are pivoted about its axis can, which in turn the location of the guide groove 16 for the sliding block 17 is changed. With the lever 55 so the lifting height is the a Presser 25 and the fabric conveyor 29 set. The smallest and the largest value of the adjustable lifting height a is indicated by two on the arm 1 attached adjustable limit stops 56, 57 set between which engages a mounted on the control shaft 15 lever 58. It For example, 2.0 mm ≤ a ≤ 8.0 mm.

Mit der Stellwelle 15 ist ein Dreh-Potentiometer 59 gekoppelt, das über eine Signal-Leitung 60 die Drehwinkelstellung der Stellwelle 15 als Messgröße an die Steuerung 8 meldet.With the control shaft 15, a rotary potentiometer 59 is coupled, via a signal line 60, the rotational angular position of the control shaft 15 as a measured variable to the controller 8 reports.

Auf dem Arm 1 befindet sich ein nur in Fig. 4 dargestellter Nadelfaden-Vorrat 61. Der Nadelfaden 62 wird von diesem Vorrat 61 in üblicher Weise über eine Faden-Spann-Vorrichtung 63, einen Fadenhebel 64 und eine Faden-Klemme 65 zur Nadel 11 geführt. Die Faden-Spann-Vorrichtung 63 ist aus der DE 28 09 848 C2 (entsprechend US 4, 289, 087) bekannt. Sie weist zwei den Nadelfaden 62 zwischen sich führende Faden-Spannscheiben 68 und einen Elektromagneten 67 auf. Entsprechend der an den Elektromagneten 67 angelegten elektrischen Spannung wird zwischen den Spannscheiben 66 somit eine einstellbare Reibungskraft auf den Nadelfaden 62 ausgeübt, wodurch dieser eine entsprechende Fadenspannung erhält.On the arm 1 is a shown only in Fig. 4 needle thread supply 61. The needle thread 62 is from this stock 61 in the usual way via a thread tensioning device 63, a thread lever 64 and a thread clamp 65 led to the needle 11. The thread tensioning device 63 is from DE 28 09 848 C2 (corresponding to US 4,289,087). She points two the needle thread 62 between them thread tension discs 68th and an electromagnet 67. According to the electromagnet 67 applied voltage is between the clamping washers 66 thus an adjustable friction force on the needle thread 62nd exerted, whereby this receives a corresponding thread tension.

Die Faden-Klemme 65, die der Nadel 11 unmittelbar vorgeordnet ist, weist eine Spannscheibe 68 auf, die an einer Führungsstange 69 befestigt ist, die wiederum mittels einer Druckfeder 70 belastet ist, wodurch die Spannscheibe 68 gegen ein Widerlager 71 gezogen wird, das am Arm 1 befestigt ist. Am Widerlager 71 ist weiterhin ein durch eine Drahtwicklung 72 gebildeter Elektromagnet 72 angebracht, der mittels einer Ansteuer-Leitung 73 von der Steuerung 8 her ansteuerbar ist.The thread clamp 65, which is immediately upstream of the needle 11, points a clamping washer 68 which is fixed to a guide rod 69, the is again loaded by a compression spring 70, whereby the clamping disc 68 is pulled against an abutment 71 which is attached to the arm 1 is. At the abutment 71 is further formed by a wire winding 72 Electromagnet 72 mounted by means of a drive line 73 can be controlled by the controller 8 forth.

Zum Nähen werden zwei Nähgutteile 74, 75 übereinander über die auf der Grundplatte 2 ausgebildete Stichplatte 76 geführt. Die Stichplatte 76 ist mit einem Ausschnitt versehen, durch den ein unterer Stoffschieber 77 hindurch ragt, der ein Stichloch 77a für den Durchtritt der Nadel 11 aufweist. Der untere Stoffschieber 77 ist kinematisch mit dem erwähnten Schubgetriebe derart verbunden, dass das Stichloch 77a synchron mit der während der Stichbildung in die Nähgutteile 74, 75 einstechenden und die Transportbewegung ebenfalls ausführenden Nadel 11 bewegt wird. Der geschilderte Aufbau und die Arbeitsweise sind bei Nähmaschinen mit sogenanntem Nadeltransport üblich und allgemein bekannt.For sewing two workpieces 74, 75 on top of each other on the Base plate 2 trained throat plate 76 out. The throat plate 76 is with provided a cut through which a lower feed dog 77 through protrudes, which has a tap hole 77a for the passage of the needle 11. The lower feed dog 77 is kinematically with the mentioned thrust gear connected such that the stitch hole 77 a in synchronism with during the stitch formation in the Nähgutteile 74, 75 piercing and the transport movement also executing needle 11 is moved. The described Construction and operation are in sewing machines with so-called Needle transport common and well known.

Die beiden Nähgutteile 74, 75 haben eine Gesamt-Dicke s. Die Hubhöhe a der Füße 28, 32 über die Nähgutteile 74, 75 stellt die Bedienungsperson mittels des Stellhebels 55 ein. Es wird hierbei davon ausgegangen, dass die Bedienungsperson mit zunehmender Dicke s der Nähgutteile 74, 75 die Hubhöhe a vergrößert, da mit zunehmender Dicke s die Komprimierbarkeit der beiden Nähgutteile 74, 75 zunimmt.The two workpieces 74, 75 have a total thickness s. The lifting height a the feet 28, 32 on the workpieces 74, 75 represents the operator by means of the control lever 55 a. It is assumed that the Operator with increasing thickness s of the workpiece parts 74, 75 the Lifting height a increases, because with increasing thickness s the compressibility the two workpieces 74, 75 increases.

Bei einem normalen Nähvorgang taucht die Nadel 11 mit dem Nadelfaden 62 durch die Nähgutteile 74, 75 in das Stichloch 77a ein. Hierbei befindet sich der Transport-Fuß 32 in abgesenkter Stellung und der Stoffschieber 77 in einer angehobenen Stellung, so dass die Nähgutteile 74, 75 zwischen dem Stoffschieber 77 und dem Transport-Fuß 32 eingespannt sind. Zu diesem Zeitpunkt befindet sich der Drücker-Fuß 28 entsprechend der Hubhöhe a oberhalb des Nähgutteils 74, so dass ein ungehindertes Vorschieben der von der Nadel 11 durchsetzten Nähgutteile 74, 75 in einer Vorschubrichtung 82 erfolgt. Hierbei ist die Faden-Klemme 65 geöffnet, so dass der Nadelfaden 62 infolge der Abwärtsbewegung der Nadel 11 ungehindert nachgezogen werden kann.In a normal sewing operation, the needle 11 dives with the needle thread 62 through the Nähgutteile 74, 75 in the needle hole 77 a. Hereby is the transport foot 32 in the lowered position and the feed dog 77th in a raised position, so that the Nähgutteile 74, 75 between the feed dog 77 and the transport foot 32 are clamped. To this Time is the pusher foot 28 according to the lifting height a above the fabric part 74, so that unimpeded advancing the from the needle 11 interspersed Nähgutteile 74, 75 in a feed direction 82 takes place. Here, the thread clamp 65 is opened, so that the needle thread 62 unimpeded as a result of the downward movement of the needle 11 can be.

Wenn die Nadel 11 nach Durchlaufen ihrer untersten Stellung sich wieder etwa 2,5 Millimeter nach oben bewegt hat, erfasst die Greiferspitze 79 des sich drehenden Greifers 12 die bei der Aufwärtsbewegung der Nadel 11 gebildete Nadel-Faden-Schleife 78. Mit fortschreitender Aufwärtsbewegung der Nadel 11 tritt diese schließlich aus den Nähgutteilen 74, 75 aus. Inzwischen hat der Greifer 12 eine völlige Umschlingung der Nadel-Faden-Schleife 78 um den Greiferfaden-Vorrat 13 bewirkt. Anschließend wird der überschüssige Nadelfaden 62 durch den Fadenhebel 64 unter Bildung einer Doppelsteppstich-Naht 81 zurückgezogen. Danach werden der Drücker-Fuß 28 und der Transport-Fuß 32 umgesetzt, so dass der Drücker-Fuß 28 auf den Nähgutteilen 74, 75 aufsetzt und der Transport-Fuß 32 um die Hubhöhe a von denselben abhebt. Während des normalen Nähvorgangs dient die Faden-Klemme 65 lediglich als Führung des Nadelfadens 62; sie bremst ihn also nicht. Die beschriebene Stichbildung und die Arbeitsweise der alternierend arbeitenden Drücker-Füße 28, 32 mit Nadeltransport sind üblich und bekannt.When the needle 11 returns after passing through its lowermost position about 2.5 millimeters has moved up, the gripper tip 79 of the detected rotating gripper 12 during the upward movement of the needle eleventh formed needle-thread loop 78. With progressive upward movement the needle 11 finally exits them from the fabric parts 74, 75. Meanwhile, the gripper 12 has a complete looping of the needle-thread loop 78 causes the looper thread supply 13. Subsequently, the Excess needle thread 62 through the thread lever 64 to form a Lockstitch seam 81 withdrawn. After that, the pusher foot 28 and the transport foot 32 implemented, so that the pusher foot 28th on the workpieces 74, 75 touches and the transport foot 32 to the Lifting height a lifts from the same. During normal sewing the thread clamp 65 serves only as a guide of the needle thread 62; she so do not slow him down. The described stitch formation and the way of working the alternating-acting pusher feet 28, 32 are with needle transport common and known.

Beim ersten zu nähenden Stich einer Naht 81 befindet sich das freie Ende 83 des Nadelfadens 62, also der Nadelfadenanfang, oberhalb der Nähgutteile 74, 75 und ist zwischen dem oberen Nähgutteil 75 und dem Drücker-Fuß 28 eingeklemmt und zwar mit einer von der Vorspannung der Druckfeder 43 abhängigen Kraft. Um beim Ausziehen der Nadelfaden-Schleife 78 beim entsprechenden Umlauf der Greiferspitze 79 zu erreichen, dass dieses freie Ende 83 durch die Nähgutteile 74, 75 nach unten durchgezogen wird, muss während des Ausziehens der Nadelfaden-Schleife 78 der Drücker-Fuß 28 entlastet werden. Dies geschieht durch entsprechende Beaufschlagung des Anschlag-Verstell- Antriebs 46 mit Druckluft, wodurch der Anschlag-Hebel 44 mit dem Anschlag 45 angehoben und gegen den Lenker 41 zur Anlage kommt. Hierdurch wird der dreieckförmige Antriebs-Hebel 38 leicht verschwenkt, wodurch die Stoffdrücker-Stange 27 und damit auch der Drücker-Fuß 28 geringfügig angehoben werden, ohne dass der Drücker-Fuß 28 von den Nähgutteilen 74, 75 abgehoben wird. Es erfolgt also eine Druckentlastung der Nähgutteile 74, 75 und damit eine Reduzierung der das Ausziehen des freien Endes 83 des Nadelfadens 62 hindernden Reibkraft. Die hierbei auftretende Abwärtsbewegung des Transport-Fußes 32 ist funktionell bedeutungslos, da der Fuß 32 nicht mit den Nähgutteilen 74, 75 in Kontakt kommt. Wie sich aus dem Vorstehenden ergibt, ist der Anschlag-Verstell-Antrieb 46 also ein Entlastungs-Antrieb für den Stoffdrücker 25. Den Transport-Fuß 32 zu entlasten, um das freie Ende 83 des Nadelfadens 62 auf die Unterseite des Nähgutteils 75 zu ziehen, ist vom Prinzip her aus der DE 36 04 299 C2 (entsprechend US 4,658,752) bekannt.The first seam to be sewn seam 81 is the free end 83 of the needle thread 62, so the needle thread beginning, above the workpieces 74, 75 and is between the upper fabric part 75 and the pusher foot 28 clamped with one of the bias of the Compression spring 43 dependent force. To take off the needle thread loop 78 to reach the corresponding round of the hook tip 79, that this free end 83 pulled through the workpieces 74, 75 down must, during the extraction of the needle thread loop 78 of the Pusher foot 28 are relieved. This is done by appropriate admission the stop adjustment drive 46 with compressed air, whereby the stop lever 44 is raised with the stop 45 and against the Handlebar 41 comes to the plant. This will cause the triangular drive lever 38 slightly pivoted, causing the presser bar 27th and thus also the pusher foot 28 are slightly raised, without the pusher foot 28 is lifted off the fabric parts 74, 75. It So there is a pressure relief of the fabric parts 74, 75 and thus a Reduction of the extension of the free end 83 of the needle thread 62 hindering friction force. The case occurring downward movement of the Transport foot 32 is functionally meaningless, since the foot 32 is not with the Nähgutteilen 74, 75 comes into contact. As is clear from the above results, the abutment adjustment drive 46 is thus a relief drive for the presser foot 25. Relieve the transport foot 32 in order to the free end 83 of the needle thread 62 on the underside of the workpiece 75 to draw, is in principle from DE 36 04 299 C2 (according to US 4,658,752).

Der Abstand b des Anschlags 45 vom Lenker 41 nimmt mit zunehmender Dicke s der Nähgutteile 74, 75 zu, d.h. der Leerhub vom Beginn des Ausfahrens der Kolbenstange 47 bis zur Anlage des Anschlags 45 am Lenker 41 nimmt mit zunehmender Nähgut-Dicke s zu. Um dies zu kompensieren, wird mit zunehmender Hubhöhe a die Dauer der Aktivierung des Anschlag-Verstell-Antriebs 46 vergrößert und zwar entsprechend einer empirisch ermittelten, in Fig. 7 angedeuteten Funktion, wo die Beaufschlagungszeit t über der Hubhöhe a dargestellt ist. Diese Funktion ist in einem ROM 84 der Steuerung 8 niedergelegt. Die Hubhöhe a wird durch das Dreh-Potentiometer 59 beim entsprechenden Verstellen der Stellwelle 15 in die Steuerung 8 gegeben, so dass dort entsprechend der Funktion t = f(a) die Ansteuerung des Ventils 52 und damit des Antrieb 46 ausgelöst wird. Je größer die Nähgut-Dicke s ist, umso größer ist - wie oben angedeutet - die Hubhöhe a. Mit steigender Hubhöhe a wird also die Ansteuerdauer des Anschlag-Verstell-Antriebs 46 erhöht, wodurch der Zeitverlust beim Leerhub über die Strecke b kompensiert wird. Außerdem wird die mit zunehmender Dicke s der Nähgutteile 74, 75 zunehmende Komprimierbarkeit der Nähgutteile 74, 75 ausgeglichen.The distance b of the stopper 45 from the handlebar 41 increases with increasing Thickness s of the fabric pieces 74, 75 too, i. the idle stroke from the beginning of the extension the piston rod 47 to the abutment of the stop 45 on the handlebars 41 increases with increasing material thickness s. To compensate, becomes with increasing the lifting height a the duration of the activation of the stop adjustment drive 46 enlarged and that according to an empirical determined, in Fig. 7 indicated function, where the loading time t is shown above the lifting height a. This feature is in one ROM 84 of the controller 8 down. The lifting height a is determined by the Rotary potentiometer 59 at the corresponding adjustment of the actuating shaft 15th into the controller 8 so that there according to the function t = f (a) the control of the valve 52 and thus the drive 46 is triggered. The larger the fabric thickness s is, the larger - as indicated above - the lifting height a. With increasing lifting height a so the driving time of the Stop adjustment drive 46 increases, whereby the loss of time during the idle stroke is compensated over the distance b. In addition, the with increasing Thickness s of the fabric parts 74, 75 increasing compressibility of the Workpiece parts 74, 75 balanced.

Claims (5)

Verfahren zum Ziehen des freien Fadenendes (83) eines Nadelfadens (62) von der Oberseite mindestens eines Nähgutteiles (74, 75) auf dessen Unterseite beim ersten Stich einer zu nähenden Naht (81) mit einer Nähmaschine mit einer auf- und abbewegbaren, den mittels eines Fadenhebels (64) von einem Nadelfaden-Vorrat (61) abgezogenen Nadelfaden (62) führenden Nadel (11) mit mindestens einem auf das mindestens eine Nähgutteil (74, 75) aufsetzbaren und von diesem abhebbaren Stoffdrücker (25) und mit einem drehantreibbaren Greifer (12), dessen Greiferspitze (79) eine Nadelfaden-Schleife (78) ergreift und zur Stichbildung auszieht, wobei der Nadelfaden (62) zwischen Nadel (11) und Fadenhebel (64) festgehalten wird, während die Nadelfaden-Schleife (78) von der Greiferspitze (79) ausgezogen wird, so dass das freie Fadenende (83) von der Greiferspitze (79) durch das Nähgutteil (74, 75) hindurch gezogen wird und wobei während des Festhaltens des Nadelfadens (62) der Stoffdrücker (25) zumindest teilweise entlastet wird,    dadurch gekennzeichnet,    dass mit zunehmender Dicke (s) des mindestens einen Nähgutteils (74, 75) die Dauer (t) der Entlastung erhöht wird. Method for drawing the free thread end (83) of a needle thread (62) from the upper side of at least one fabric part (74, 75) on its underside at the first stitch of a seam (81) to be sewn with a sewing machine with a needle (11) which can be moved up and down, the needle thread (62) drawn from a needle thread supply (61) by means of a thread lever (64) with at least one on the at least one fabric part (74, 75) attachable and liftable by this presser foot (25) and with a rotatably drivable gripper (12) whose gripper tip (79) grips a needle thread loop (78) and pulls it out to form a stitch, wherein the needle thread (62) is held between the needle (11) and the thread lever (64) while the needle thread loop (78) is pulled out of the hook tip (79) so that the free thread end (83) is separated from the hook tip (79). through the fabric part (74, 75) is pulled through and wherein during the retention of the needle thread (62) the presser foot (25) is at least partially relieved, characterized in that with increasing thickness (s) of the at least one Nähgutteils (74, 75), the duration (t) of the discharge is increased. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Entlastung in Abhängigkeit von der Hubhöhe (a) des mindestens einen Stoffdrückers (25) erfolgt.A method according to claim 1, characterized in that the relief in dependence on the lifting height (a) of the at least one presser foot (25). Nähmaschine zur Durchführung des Verfahrens nach einem der Ansprüche 1 oder 2, mit einer auf- und abbewegbaren, den mittels eines Fadenhebels (64) von einem Nadelfaden-Vorrat (61) abgezogenen Nadelfaden (62) führenden Nadel (11), mit mindestens einem auf das mindestens eine Nähgutteil (74, 75) aufsetzbaren und von diesem abhebbaren Stoffdrücker (25), mit einem drehantreibbaren Greifer (12), dessen Greiferspitze(79) eine Nadelfaden-Schleife (78) ergreift und zur Stichbildung auszieht, mit einer zwischen Fadenhebel (64) und Nadel (11) ortsfest vorgesehenen Faden-Klemme (65) für den Nadelfaden (62) mit einem Stoffdrücker-Antrieb und mit einer Steuerung (8) für die Faden-Klemme (65) und den Stoffdrücker-Antrieb, dadurch gekennzeichnet, dass ein Stoffdrücker-Entlastungs-Antrieb entsprechend einer in der Steuerung (8) abgelegten, die Abhängigkeit der Dauer der Betätigung des Stoffdrücker-Entlastungs-Antriebs von der Dicke (s) des mindestens einen Nähgutteils (74, 75) wiedergebenden Funktion von der Steuerung (8) ansteuerbar ist.Sewing machine for carrying out the method according to one of claims 1 or 2, with a needle (11) which can be moved up and down, the needle thread (11) being withdrawn by means of a thread lever (64) from a needle thread supply (61), with at least one presser foot (25) which can be placed on the at least one fabric part (74, 75) and can be lifted off by it; with a rotatably drivable gripper (12) whose gripper tip (79) grips a needle thread loop (78) and pulls it out to form a stitch, with a thread clamp (65) for the needle thread (62) fixedly provided between thread lever (64) and needle (11) with a cloth presser drive and with a control (8) for the thread clamp (65) and the presser foot drive, characterized in that a presser-relief drive in accordance with a stored in the control (8), the dependence of the duration of actuation of the presser-relief drive on the thickness (s) of the at least one sewing material (74, 75) reproducing function of the controller (8) is controllable. Nähmaschine nach Anspruch 3, dadurch gekennzeichnet, dass ein alternierend zu dem Stoffdrücker (25) antreibbarer Stofftransporteur (29) vorgesehen ist,
dass ein gemeinsamer Antrieb für den Stoffdrücker (25) und den Stofftransporteur (29) vorgesehen ist, und
dass der Stoffdrücker-Entlastungsantrieb als Drücker-Abhebe-Antrieb (46) ausgebildet istSewing machine according to claim 3, characterized in that an alternately to the fabric presser (25) drivable material conveyor (29) is provided,
that a common drive for the presser foot (25) and the material conveyor (29) is provided, and
in that the presser foot release drive is designed as a push-button lift-off drive (46) Nähmaschine nach Anspruch 4, dadurch gekennzeichnet, dass ein einstellbares Hubgetriebe (14) zur Einstellung der Hubhöhe (a) des Stoffdrückers (25) vorgesehen ist, und
dass ein mit dem Hubgetriebe (14) gekoppeltes Potentiometer (59) vorgesehen ist zur Erfassung und Weitergabe zur Steuerung (8) der am Hubgetriebe (14) eingestellten Hubhöhe (a) des Stoffdrückers (25).Sewing machine according to claim 4, characterized in that an adjustable lifting gear (14) for adjusting the lifting height (a) of the fabric presser (25) is provided, and
in that a potentiometer (59) coupled to the lifting gear (14) is provided for detecting and passing on to the control (8) of the lifting height (a) of the cloth presser (25) set on the lifting gear (14).
EP03015351A 2002-07-27 2003-07-08 Method and sewing machine for drawing the free end of a needle thread from the upper surface of a piece of fabric to its lower surface Expired - Lifetime EP1384806B1 (en)

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DE10234251 2002-07-27
DE10234251A DE10234251C1 (en) 2002-07-27 2002-07-27 Sewing machine stitching mechanism relaxes the pressure on the fabric by the presser foot, when the upper thread is clamped between the needle and thread lever on the first seam stitch, for an extended duration with a thicker fabric

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EP1384806B1 (en) 2007-03-07
KR20040012479A (en) 2004-02-11
KR100987843B1 (en) 2010-10-13
SI1384806T1 (en) 2007-08-31
JP2004057822A (en) 2004-02-26
JP4310144B2 (en) 2009-08-05
DE10234251C1 (en) 2003-10-09
CN1478937A (en) 2004-03-03
ATE356239T1 (en) 2007-03-15
PT1384806E (en) 2007-05-31

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